package com.superjson.showpro.base.interceptor;

import com.beantools.constants.Charset;
import com.beantools.util.CollectionUtil;
import com.superjson.showpro.entity.User;
import com.superjson.showpro.shared.exception.GeneralBizException;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.util.List;

import static com.beantools.util.ObjectUtil.isNotNull;
import static com.beantools.util.ObjectUtil.isNull;
import static com.superjson.showpro.base.HeaderEnum.CONTENT_LANGUAGE;
import static com.superjson.showpro.constants.SessionConstant.*;
import static com.superjson.showpro.shared.result.ResultCodeEnum.USER_NO_LOGIN;

/**
 * 请求拦截器，处理跨域问题
 */
public class LoginInterceptor implements HandlerInterceptor {


    private List<String> validateUrls;

    public void setValidateUrls(List<String> validateUrls) {
        this.validateUrls = validateUrls;
    }

    public List<String> getValidateUrls() {
        return validateUrls;
    }

    /**
     * 在业务处理器处理请求之前被调用 如果返回false
     * 从当前的拦截器往回执行所有拦截器的afterCompletion(),
     * 再退出拦截器链, 如果返回true 执行下一个拦截器,
     * 直到所有的拦截器都执行完毕 再执行被拦截的Controller
     * 然后进入拦截器链,
     * 从最后一个拦截器往回执行所有的postHandle()
     * 接着再从最后一个拦截器往回执行所有的afterCompletion()
     *
     * @param request
     * @param response
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response,
                             Object handler) throws Exception {
        response.setHeader(CONTENT_LANGUAGE.key(), CONTENT_LANGUAGE.value());
        response.setCharacterEncoding(Charset.CHARSET);
        HttpSession session = request.getSession();
        String token = (String) session.getAttribute(TOKEN);
        User user = (User) session.getAttribute(SESSION_USER);
        String name = (String) session.getAttribute(SESSION_NAME);
        if (CollectionUtil.isNotEmpty(validateUrls)) {
            for (String validateUrl : validateUrls) {
                String servletPath = request.getServletPath();
                if (servletPath.equalsIgnoreCase(validateUrl)) {
                    if (isNull(token) || isNull(user)) {
                        throw new GeneralBizException(USER_NO_LOGIN);
                    }
                    if (!user.getToken().equalsIgnoreCase(token)) {
                        throw new GeneralBizException(USER_NO_LOGIN);
                    }
                }
            }
        }
        response.setHeader(SESSION_NAME, name);
        response.setHeader(TOKEN, token);
        response.setHeader(USER_ID, isNotNull(user) ? user.getId().toString() : null);
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
                           ModelAndView modelAndView) throws Exception {

    }

    /**
     * 在DispatcherServlet完全处理完请求后被调用
     * 当有拦截器抛出异常时,
     * 会从当前拦截器往回执行所有的拦截器的afterCompletion()
     *
     * @param request
     * @param response
     * @param handler
     */
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response,
                                Object handler, Exception ex) throws Exception {

    }
}
